i have an 02 dakota with a 3.9. It has just about 100K miles on it. I was looking into getting a shift kit for it. i have heard that it helps the tranny last longer and make stronger shifts. can anyone tell me a little bit more about the kit and what it does. how do you install it and how hard is it to install. also how where can i find one and how much do they cost. thanks in advance for the information.